bro what are you doing at 2.2.1 still?
lol, 3.1 > 3.0, atleast iphone wise, not sure about the ipt
my iphones battery lasts a LOT longer with 3.1..
Get 3.1, its worth it, a lot of new stuff compared to 2.x!!!
And if your ipod is still on warranty, you can get the 3.0 update for free, just go to the apple store, say somethings wrong with your ipods battery, that it lasts an hour, and they will update it for free, or give u a new ipod, totally legit way of getting it free, and possible a new ipod

lol